How long does a 200 ml bottle last and how should I store it?

A 200 ml bottle typically provides 30–40 applications for shoulder-length hair of average density when used 2–3 times per week, equating to about 2–3 months. Very long or thick hair will use more per wash; fine or short hair will use less. Store the bottle upright at room temperature (15–25°C), cap tightly closed, and away from direct sunlight or heat sources (radiators, windowsills) to preserve the stability of the botanical extracts and the Trichogen® complex. The period-after-opening (PAO) symbol on the packaging — usually an open jar with "12M" — indicates 12 months of safe use after first opening; write the opening date on the label with a marker. Do not dilute the product with water or transfer it to another container, as this can introduce microbes and compromise the preservative system. If the texture becomes watery, separates, or develops an off smell before the PAO expires, discard it. Keep out of reach of children.